> {quote:title=pfaraji wrote:}{quote} > I need to measure the magnetic permeability (μ’) of thin films (thickness<0.050mm) at frequencies starting at 100kHz range. Is there any equipment at this frequency range and for thin sheet materials? I've never done any work in this area, but here is my thoughts on it. A solution to measuring the permeability requires three things. 1) A measuring instrument. 2) A fixture to hold your thin film. 3) A literature search. Keysight sell lots of instruments that cover this frequency range (e.g. E5061B impedance analyzer covers 100 kHz to 1.5 GHz / 3 GHz), but to my knowledge they don't sell any fixtures for thin films. I met one of their materials specialists at a mm wave/THz meeting in the UK some time ago, although I believe she works at Santa Rosa. Maybe she could give you some specific advice, although I don't recall her name. But a quick search with Google Scholar shows plenty of papers on the subject. For example. High-frequency permeability of soft magnetic thin films with uniaxial anisotropyM Hayakawa et al 1992 Meas. Sci. Technol. 3 1103

shows a system for use from 100 kHz to 200 MHz which used an Advantest VNA (personally I would never buy an Advantest VNA). I don't think the paper looks particularly good, but it was the first I found on the subject that covered the frequency range of interest to you.

This sounds like an M.Sc. or Ph.D project. You should learn how to do a literature search, which was number 3 on my list of things that are needed to solve the problem.